Remove setRun and fix PowerIterationClustering failed test.

Conflicts:
	mllib/src/main/scala/org/apache/spark/mllib/clustering/PowerIterationClustering.scala

Author: viirya

mllib/src/main/scala/org/apache/spark/mllib/clustering/PowerIterationClustering.scala

@@ -271,7 +271,6 @@ object PowerIterationClustering extends Logging {
     val points = v.mapValues(x => Vectors.dense(x)).cache()
     val model = new KMeans()
       .setK(k)
-      .setRuns(5)
       .setSeed(0L)
       .run(points.values)
     points.mapValues(p => model.predict(p)).cache()